Chicken Club

Place chicken in saucepan with enough cold water to cover, plus 1 inch. Bring to a simmer (do not boil) over medium heat, and simmer until chicken is cooked through or meat thermometer inserted in center reaches 170°F, about 18 minutes. Drain and cool completely.

Dice chicken and place in medium bowl. Stir in apple pieces, 4 tablespoons mayonnaise, yogurt, salt, and pepper. Spread remaining mayonnaise on toast slices.